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btrfs: publish per-super features in sysfs 

This patch publishes information on which features are enabled in the
file system on a per-super basis. At this point, it only publishes
information on features supported by the file system implementation.

Signed-off-by: Jeff Mahoney <jeffm@suse.com>
Signed-off-by: Josef Bacik <jbacik@fusionio.com>
Signed-off-by: Chris Mason <clm@fb.com>
This commit is contained in:
Jeff Mahoney 2013-11-01 13:06:59 -04:00 committed by Chris Mason
parent 5ac1d209f1
commit 510d73600a
1 changed files with 67 additions and 18 deletions
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85
fs/btrfs/sysfs.c
View File

@ -28,29 +28,53 @@
#include "transaction.h"
#include "sysfs.h"
static void btrfs_release_super_kobj(struct kobject *kobj);
static struct kobj_type btrfs_ktype = {
.sysfs_ops = &kobj_sysfs_ops,
.release = btrfs_release_super_kobj,
};
static inline struct btrfs_fs_info *to_fs_info(struct kobject *kobj);
static inline struct btrfs_fs_info *to_fs_info(struct kobject *kobj)
static u64 get_features(struct btrfs_fs_info *fs_info,
enum btrfs_feature_set set)
{
if (kobj->ktype != &btrfs_ktype)
return NULL;
return container_of(kobj, struct btrfs_fs_info, super_kobj);
}
static void btrfs_release_super_kobj(struct kobject *kobj)
{
struct btrfs_fs_info *fs_info = to_fs_info(kobj);
complete(&fs_info->kobj_unregister);
struct btrfs_super_block *disk_super = fs_info->super_copy;
if (set == FEAT_COMPAT)
return btrfs_super_compat_flags(disk_super);
else if (set == FEAT_COMPAT_RO)
return btrfs_super_compat_ro_flags(disk_super);
else
return btrfs_super_incompat_flags(disk_super);
}
static ssize_t btrfs_feature_attr_show(struct kobject *kobj,
struct kobj_attribute *a, char *buf)
{
return snprintf(buf, PAGE_SIZE, "0\n");
int val = 0;
struct btrfs_fs_info *fs_info = to_fs_info(kobj);
if (fs_info) {
struct btrfs_feature_attr *fa = to_btrfs_feature_attr(a);
u64 features = get_features(fs_info, fa->feature_set);
if (features & fa->feature_bit)
val = 1;
}
return snprintf(buf, PAGE_SIZE, "%d\n", val);
}
static umode_t btrfs_feature_visible(struct kobject *kobj,
struct attribute *attr, int unused)
{
struct btrfs_fs_info *fs_info = to_fs_info(kobj);
umode_t mode = attr->mode;
if (fs_info) {
struct btrfs_feature_attr *fa;
u64 features;
fa = attr_to_btrfs_feature_attr(attr);
features = get_features(fs_info, fa->feature_set);
if (!(features & fa->feature_bit))
mode = 0;
}
return mode;
}
BTRFS_FEAT_ATTR_INCOMPAT(mixed_backref, MIXED_BACKREF);
@ -78,11 +102,27 @@ static struct attribute *btrfs_supported_feature_attrs[] = {
static const struct attribute_group btrfs_feature_attr_group = {
.name = "features",
.is_visible = btrfs_feature_visible,
.attrs = btrfs_supported_feature_attrs,
};
/* /sys/fs/btrfs/ entry */
static struct kset *btrfs_kset;
static void btrfs_release_super_kobj(struct kobject *kobj)
{
struct btrfs_fs_info *fs_info = to_fs_info(kobj);
complete(&fs_info->kobj_unregister);
}
static struct kobj_type btrfs_ktype = {
.sysfs_ops = &kobj_sysfs_ops,
.release = btrfs_release_super_kobj,
};
static inline struct btrfs_fs_info *to_fs_info(struct kobject *kobj)
{
if (kobj->ktype != &btrfs_ktype)
return NULL;
return container_of(kobj, struct btrfs_fs_info, super_kobj);
}
void btrfs_sysfs_remove_one(struct btrfs_fs_info *fs_info)
{
@ -91,13 +131,22 @@ void btrfs_sysfs_remove_one(struct btrfs_fs_info *fs_info)
wait_for_completion(&fs_info->kobj_unregister);
}
/* /sys/fs/btrfs/ entry */
static struct kset *btrfs_kset;
int btrfs_sysfs_add_one(struct btrfs_fs_info *fs_info)
{
int error;
init_completion(&fs_info->kobj_unregister);
fs_info->super_kobj.kset = btrfs_kset;
error = kobject_init_and_add(&fs_info->super_kobj, &btrfs_ktype, NULL,
"%pU", fs_info->fsid);
error = sysfs_create_group(&fs_info->super_kobj,
&btrfs_feature_attr_group);
if (error)
btrfs_sysfs_remove_one(fs_info);
return error;
}